Port configuration of a server application on linux

Hello,
I am developing a server application. I am using Eclipse as the development environment. I am working on Linux Fedora 1.5. And as servlet container I am using Apache-Tomcat 5.5.
When I run my project on the server with default values it works fine. Here is the address I am using:
http://localhost:8080/ProjectName/ServletName
However, I want my project to work on port 80.
First of all, in order to make this modification do I need to have root rights?
I configured project settings on Eclipse so that the application later will listen to requests on port 80. But somehow it didn't work. I am wondering if I am missing sth or not. Can someone share his/her experience with me pls..?
Thanks & Regards

Hi!
Thank a lot for the answer. I solved the problem. Eclipse said that the port 80 is already in use, so I concantrated on this. However, i tried to run the tomcat server as root (in linux) and it worked at this time. The problem was usage right. nothing was running on port 80 actually, but I couldn't understand why Eclipse said so.
And the command 'lsof -i :80'. I don't know this command. I tried to run it but I got a command not found error. I tried both as normal user and root. Did you write a letter wrong in this command..? Or am I doing sth wrong here? Why didn't it work out? Since I am not that good in linux, I would like to learn this command. Sth very important I guess..
Thanks & Regards

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     I have moved my client to the system in other LAN, current client ip is 10.232.66.67.
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server farm      predictor           nat   reals   bind id interface(s)
LA             LEASTCONNS          S     2       0
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tcp        0      0 10.232.11.211:8080           10.232.66.67:6307          SYN_RECV    -
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But same is not happening through the 7604.
Only change I do on my client config file is just uncomment the 7604 vip or the real ip for my client to connect:
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